Lumia 521- Updated to 8.1 today- now the pictures are all screwed up.

Never had any issues with this phone until today. Updated to 8.1 Cyan. Now the images are mostly gone and scattered randomly about the picture gallery surrounded by mostly blank black squares. Interestingly, the same pictures on the Windows Phone app on my 8.1 laptop are screwed up in the same way. Of the few pictures I can see, they are mostly multiples of the SAME image...... The "skydrive" seems to be called "onedrive" now, and the pictures ARE in there mostly. But "Camera Roll" and "Saved Pictures" are corrupt. What gives? Any ideas regarding what is wrong here? Thanks in advance.